C++驗證IP是否可以PING通

 

#include <Winsock2.h>
#include "iphlpapi.h" 

  
#pragma comment(lib,"Iphlpapi.lib")
#pragma comment(lib,"Ws2_32.lib")

typedef HANDLE (WINAPI* ICMPCREATEFILE)(VOID);  
typedef BOOL (WINAPI* ICMPCLOSEHANDLE)(HANDLE);  
typedef DWORD (WINAPI* ICMPSENDECHO)(HANDLE, DWORD, LPVOID, WORD,PIP_OPTION_INFORMATION, LPVOID, DWORD, DWORD);   
                      
//定義三個指針函數  
ICMPCREATEFILE pIcmpCreateFile;  
ICMPCLOSEHANDLE pIcmpCloseHandle;  
ICMPSENDECHO pIcmpSendEcho;

// 函數功能：初始化ICMP函數：
BOOL InitIcmp()  
{  
    HINSTANCE hIcmp = LoadLibrary("ICMP.DLL");  
    if(hIcmp==NULL)

　　{  
        return false; 

　　} 
    pIcmpCreateFile = (ICMPCREATEFILE)GetProcAddress(hIcmp,"IcmpCreateFile");  
    pIcmpCloseHandle = (ICMPCLOSEHANDLE)GetProcAddress(hIcmp,"IcmpCloseHandle");  
    pIcmpSendEcho = (ICMPSENDECHO)GetProcAddress(hIcmp,"IcmpSendEcho");  
    if ((pIcmpCreateFile == NULL)||(pIcmpCloseHandle == NULL)||(pIcmpSendEcho == NULL))  
        return false;  
    return true;  
}

// 函數功能：判斷是否能ping通IP
// 函數參數：IP地址或域名
BOOL ICMPPing(char* host)
{  
    DWORD timeOut=1000;                                              //設置超時  
    ULONG hAddr=inet_addr(host);                                     //如果是IP地址就直接轉換  
    if(hAddr==INADDR_NONE)  
    {  
        hostent* hp=gethostbyname(host);                             //如果是域名就用DNS解析出IP地址  
        if(hp)  
            memcpy(&hAddr,hp->h_addr_list,hp->h_length);             //IP地址  
        else
        {  
            return false;  
        }  
    }  
    HANDLE hIp=pIcmpCreateFile();  
    IP_OPTION_INFORMATION ipoi;  
    memset(&ipoi,0,sizeof(IP_OPTION_INFORMATION));  
    ipoi.Ttl =128;                  //Time-To-Live  
                   
    unsigned char pSend[36];                                                                   //發送包  
    memset(pSend,'E',32);  
                   
    int repSize=sizeof(ICMP_ECHO_REPLY)+32;  
    unsigned char pReply[100];                                                                 //接收包  
    ICMP_ECHO_REPLY* pEchoReply=(ICMP_ECHO_REPLY*)pReply;  
                   
    DWORD nPackets=pIcmpSendEcho(hIp,hAddr,pSend,32,&ipoi,pReply,repSize,timeOut);             //發送ICMP數據報文  
                   
    if(pEchoReply->Status!=0)                                                                  //超時，可能是主機禁用了ICMP 或者目標主機不存在 
    {  
        pIcmpCloseHandle(hIp);  
        return false;  
    }  
                   
    pIcmpCloseHandle(hIp);  
    return true;  
}

int main()
{
 InitIcmp();
 ICMPPing("192.168.0.1");
 return 0;
}